If someone needs more than 4 presets why not let them have 6 or 8?
Button I could BANK 1, 2, 3
and Button II could be Bank 1B, 2B and 3B
Obviously if you program to have 30 presets that would be confusing but up to 8 or 10 could be OK.
So everytime you press on Button I, Preset Bank would go up and selected preset would A of that Bank like 1A, 2A, 3A etc.. pressing Button II would take it to 1B, 2B etc…
I use 2 presets myself but I play mostly jazz. However User Interface is my hobby so I wanted share my idea.